That isn't specific EU regulations. SEPA is both the way payments are cleared and EU rules so works cross boarder. It is the foundation (interbank infra) upon which PSD2 layers a requirement for what amounts to having APIs, and a requirement to make the API open-access, in the sense they can't privilege their own systems over these APIs. They solved (or at least it seems like they might) one of the bigger blockers of building fintech solutions: a level playing ground.